问题 解答题
(1)1
7
9
×[(
3
8
+0.25)÷(
5
6
-
5
9
)]

(2)[11.9-3.4×(10.802-9.802)]÷85%
(3)10÷25+2
1
2
×0.4-1
2
5

(4)(8
2
5
-10.5×
4
5
)×(3
1
6
+7.5)
答案

(1)1

7
9
×[(
3
8
+0.25)÷(
5
6
-
5
9
)],

=1

7
9
×[(
3
8
+
1
4
)÷(
15
18
-
10
18
)],

=1

7
9
×[
5
8
÷
5
18
],

=1

7
9
×
9
4

=4;

(2)[11.9-3.4×(10.802-9.802)]÷85%,

=[11.9-3.4×1]÷0.85,

=[11.9-3.4]÷0.85,

=8.5÷0.85,

=10;

(3)10÷25+2

1
2
×0.4-1
2
5

=0.4+2.5×0.4-1.4,

=0.4+1-1.4,

=1.4-1.4,

=0;

(4)(8

2
5
-10.5×
4
5
)×(3
1
6
+7.5)

=(8

2
5
-8.4)×(3
1
6
+7
1
2
),

=0×10

2
3

=0.

判断题
问答题 简答题